I've fixed a high priority defect: when the webserver did not have permission to back up htaccess and the option to update htaccess was ticked, an "open stream: Permission denied" error was thrown
is_writable is now verified, and the back up creation is within a try/catch
I have also added the amount of kB DeDos takes up in the cache (compared to other addons). I do this since DeDos relies strongly on the simple cache (to be able to block bots with 0 query overhead)